Roller skate



FIG. 1 is a top, right perspective view of the roller skate of my design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a right elevation view thereof;

FIG. 5 is a left elevation view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines shown represent unclaimed subject matter and form no part of the claimed design. Specifically, the buckle and teeth shown in FIGS. 1-7 are for illustrative purposes and form no part of the claimed design. 

CLAIM The ornamental design for a roller skate, as shown and described. 